I want to use trace macros. In my FreeRTOSConfig file the maro configUSE_TRACE_FACILITY is = 1. Then I have the following task: static void vPeriodicTask( void *pvParameters ) {     vTaskSetApplicationTaskTag(NULL, (void *)1);     for( ;; )     {         vTaskDelay(5);         mPORTAToggleBits(BIT_0);         IFS0bits.CS1IF = 1;     } } but when I try to compile it the following error appear: ……………………………………………….. Executing: "C:Archivos de programaMicrochipMPLAB C32binpic32-gcc.exe" -mprocessor=32MX460F512L -x c -c "main.c" -o"main.o" -MMD -MF"main.d" -I"D:ProyectosPanelSoftwarePrograma5"  -g -DMPLAB_PIC32MX_PORT -Wall -fomit-frame-pointer Executing: "C:Archivos de programaMicrochipMPLAB C32binpic32-gcc.exe" -mprocessor=32MX460F512L -x c -c "tasks.c" -o"tasks.o" -MMD -MF"tasks.d" -I"D:ProyectosPanelSoftwarePrograma5"  -g -DMPLAB_PIC32MX_PORT -Wall -fomit-frame-pointer tasks.c:1837: warning: ‘prvListTaskWithinSingleList’ defined but not used Executing: "C:Archivos de programaMicrochipMPLAB C32binpic32-gcc.exe" -mprocessor=32MX460F512L -c -MMD -MF"port_asm.d" -I"D:ProyectosPanelSoftwarePrograma5" "port_asm.S" -o"port_asm.o" -I"D:ProyectosPanelSoftwarePrograma5" -I"." -Wa,–keep-locals,–gdwarf-2 Executing: "C:Archivos de programaMicrochipMPLAB C32binpic32-gcc.exe" -mprocessor=32MX460F512L -x c -c "heap_2.c" -o"heap_2.o" -MMD -MF"heap_2.d" -I"D:ProyectosPanelSoftwarePrograma5"  -g -DMPLAB_PIC32MX_PORT -Wall -fomit-frame-pointer Executing: "C:Archivos de programaMicrochipMPLAB C32binpic32-gcc.exe" -mprocessor=32MX460F512L -x c -c "list.c" -o"list.o" -MMD -MF"list.d" -I"D:ProyectosPanelSoftwarePrograma5"  -g -DMPLAB_PIC32MX_PORT -Wall -fomit-frame-pointer Executing: "C:Archivos de programaMicrochipMPLAB C32binpic32-gcc.exe" -mprocessor=32MX460F512L -x c -c "port.c" -o"port.o" -MMD -MF"port.d" -I"D:ProyectosPanelSoftwarePrograma5"  -g -DMPLAB_PIC32MX_PORT -Wall -fomit-frame-pointer Executing: "C:Archivos de programaMicrochipMPLAB C32binpic32-gcc.exe" -mprocessor=32MX460F512L -x c -c "croutine.c" -o"croutine.o" -MMD -MF"croutine.d" -I"D:ProyectosPanelSoftwarePrograma5"  -g -DMPLAB_PIC32MX_PORT -Wall -fomit-frame-pointer Executing: "C:Archivos de programaMicrochipMPLAB C32binpic32-gcc.exe" -mprocessor=32MX460F512L -x c -c "queue.c" -o"queue.o" -MMD -MF"queue.d" -I"D:ProyectosPanelSoftwarePrograma5"  -g -DMPLAB_PIC32MX_PORT -Wall -fomit-frame-pointer Executing: "C:Archivos de programaMicrochipMPLAB C32binpic32-gcc.exe" -mprocessor=32MX460F512L "main.o" "tasks.o" "port_asm.o" "heap_2.o" "list.o" "port.o" "croutine.o" "queue.o" -o"Programa5.elf" -Wl,–defsym=__MPLAB_BUILD=1,–defsym=_min_heap_size=0,-Map="Programa5.map" main.o: In function `vPeriodicTask’: D:ProyectosPanelSoftwarePrograma5/main.c:46: undefined reference to `vTaskSetApplicationTaskTag’ D:ProyectosPanelSoftwarePrograma5/main.c:46: relocation truncated to fit: R_MIPS_26 against `vTaskSetApplicationTaskTag’ Link step failed. -——————————————————————— Release build of project `D:ProyectosPanelSoftwarePrograma5Programa5.mcp’ failed. Thu Feb 12 18:28:40 2009 -——————————————————————— BUILD FAILED I have the task.c and task.h file in the project. What is wrong?. Thank you in avanced.

Make sure that configUSE_APPLICATION_TASK_TAG =1 Below links may help you. http://www.freertos.org/vTaskSetApplicationTag.html http://www.freertos.org/rtos-trace-macros.html Regards, Prithwee.

confgUSE_TRACE_FACILITY is not required to use the trace macros. It is only for the old trace system. Best to set to 0.

The problem was that the macro ConfigUSE_APPLICATION_TASK_TAG =1 was not in the FreeRTOSConfig file. After add this macro to the file the program compiled without any problem. Thank you.